期刊
ACS OMEGA
卷 4, 期 7, 页码 12459-12469出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.9b00845
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资金
- UGC, New Delhi [F.4-5(94-FRP)/2014(BSR)]
- DST-SERB, New Delhi, India [YSS/2015/000037]
- DST, New Delhi
Design and development of multifunctional materials have drawn incredible attraction in recent years. Herein, we report the design and construction of versatile star-shaped intramolecular charge transfer (ICT)-coupled excited-state intramolecular proton transfer (ESIPT)-active mechanoresponsive and aggregation-induced emissive (AIE) luminogen triaminoguanidine-diethylaminophenol (LH3) conjugate from simple precursors triaminoguanidine hydrochloride and 4-(N,N-diethylamino) salicylaldehyde. Solvent-dependent dual emission in nonpolar to polar protic solvents implies the presence of ICT-coupled ESIPT features in the excited state. Aggregation-enhanced emissive feature of LH3 was established in the CH3CN/water mixture. Furthermore, this compound exhibits mechanochromic fluorescence behavior upon external grinding. Fluorescence microscopy images of pristine, crystal, and crushed crystals confirm the naked-eye mechanoresponsive characteristics of LH3. In addition, LH3 selectively sensed a Cu2+ ion through a colorimetric and fluorescence turn-off route, and subsequently, the LH3-Cu2+ ensemble could act as a selective and sensitive sensor for S2- in a turn-on fluorescence manner via a metal displacement approach. Reversible turn-off-turn-on features of LH3 with Cu2+/S2- ions were efficiently demonstrated to construct the IMPLICATION logic gate function. The Cu2+/S2--responsive sensing behavior of LH3 was established in the paper strip experiment also, which can easily be characterized by the naked eye under daylight as well as a UV lamp (lambda = 365 nm).
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